Find the Exact Value of the Expression If θ = $g ( \theta ) = \cos \theta \quad$

Multiple Choice

Find the exact value of the expression if θ = 30°. Do not use a calculator.
- $g ( \theta ) = \cos \theta \quad$ Find $g ( 2 \theta )$ .

A) $\frac { 1 } { 2 }$
B) $\frac { \sqrt { 3 } } { 2 }$
C) $\sqrt { 3 }$
D) 1